Device for establishing a pulsing motion of fluid in conduits.



G. DALE'N. DEVICE FOR ESTABLISHING A PULSING MOTION 0F FLUID INGONDUITS.

APPLIOATIOTI FILED APR. 6, 1907.

976,556. Patented Nov. 22, 1910.

2 SHEETS-SHEET 1.

WITIIESSES:

r27. QWIQ'nA G. DALI LN. DEVICE FOR ESTABLISHING A IULSING MOTION OIFLUID IN OONDUITS.

APPLICATION FILED APR. 6. 1907. 976,556. Patented N0v.22, 1910.

2 SHEETS-SHEET Z.

INIEII TOR mm'ssss: f Iy I a fwd/ If Y z 3y (Y k 7/1 a W fig d) 2ATTORNEY.

UNITED STATES. PATENT OFFICE.

GUSTAF DALEN, or srocKHoLmflswhpEN.

DEVICE FOR ESTABLISHING PULSING MOTION OI FLUID IN CONDUlTS.

To all whom it may concern: Be it known that I, GUSTAF DALN, engineer,subject of Sweden, residing at Stockholm,Sweden, have invented new anduseful Improvements in Devices for Establishing a Pulsing Motion, ofFluids in Conduits,

of which the follo'wing'is a specification. I

The present invention has for its object a device for automaticallyestablishing a pal-- sating'or intermittent motion of a fluid 1n aconduit, which is connected with a feeding conduit,-in which the fluidhas a constant flu'etiomof motion, established by means of a" pump orthe like. Such device may be used'in connection with a milking apparatusdnwhich' the milking members are connected with pistons movable incylinders to which itheEulsating fluid in question is led.

T e invention is illustrated in the accompanying drawings, in which"Figure 1' shows a vertical section of the pulsator'in combination withthe milking machine.- Fig. 2 shows a similar view of a modified form.

In Fig. 1 a indicates a feeding conduit connected with a receiver 13,which receiver is connected through a pipe 14.with a suitable fluidcompressor -(not shown on the drawing) and thus filled with fluid underpressure. The fluid flows from the receiver to the pulsator in thedirection indicated by the arrow a. '0 indicates another conduit inwhich a pulsating motion of the same fluid in opposite directions asindicated by the arrows 0, c is required. In the casing s of theapparatus thc conduit (1 opens at the shoulder 6, whereas the conduit 0opens at 0 In the casing is placed a block 2' which is mov able to andfro-in the manner .escribed below and s acted upon by a spring m tendingto press the block away from the shoulitsf'prolongation in the casingextends a branch conduit d, which opens into the chamber (1 beneath apiston f, which is movably positioned within the interior of the casing,and which is provided with a )iston rodg extending through the hollow pug Between the block 11 and a shoulder p on th iogl gjs inserted aspring k, tending to press Specification of Letters Pate nt.- Patented'Appllcation filed April 6, 1907. Serial No. 866,844.

Nov. 22, 1910.

the rod 9 and the piston f downward. Between-the plugj and the piston fis inserted another spring l tending topress the piston f downward. Theeasin is provided with an outlet conduit la, which communicates with thechamber k above the piston f.

The conduit 0 is connected with the milking machine, the particular formof which does not constitute an object of the present invention, througha distributing chamber 11, which is connected through plpes 9 and 10with cylinders 7 and 8. In these cylinders pistons 5 and 6 are movably'mounted being connected by rods 3 and 4 with a movable pad 2. Themilking device further comprises a stationary pad A \Vhen fluid underpressure is admitted to the cylinders 7 and 8 the pistons 5 and 6 moveforward successively, as the pipe 9 is of greater cross section than thepi e10, and .in consequence the upper .end 0 the pad will advance,thereby first squeezing the teat,

inserted in the space between the movable and the stationary pad, at theroot, shutting off. the eoinuuinication with the udder, after which thelower part of the pad is moved forward thereby pressing out the milkcontained in the teat. As soon as the pistons and the movable pad havecompleted their forward motion, the fluid in the pipe 0 is put. ineoiunmnication with the open air, as will he fully-"explained below. Assoon as the pressure behind the pistons falls to the atmosphericpressure, the spring 12 acts upon the movable pad 2 and brings the padas well as the pistons back to their former 'position, forcing the fluidto return through the pipe c and the pulsator.

As stated the fluid under acted upon the pistons 5 and 6 of the milkingdevice is discharged through the 111821- tor to the open air. Thisisei'fected 1n the pressure having following way. In the position of thepulsator shown in the drawing the fluid flows, as i indicated, from thereceiver 13, through pipe a, tln-ough'openings b and 0* andpipe 0 to themilking device. But a. portionof the fluid passes simultaneously throughthe branch conduit 05 to the chamber e beneath the piston f and pressesthis latter upward against the action of the spring Z. As' the pistonmoves upward the spring h is first compressed, beingjweaker than thespring m, until the spring h is capable of overcomingthe spring m, whenthe block 2' is moved a and the wall of the apparatus to the chamher isand the outlet conduit 7:, which leads out into the atmosphere or to asuitable receptacle. As'simultaneously with this flow the pressure inthe conduit 0 and thus also in the chamber 6 falls, the spring m firstbegins to press the block 13 away from the shoulder, 1) until itsspri'ng force amounts to that of the spring it, after which thelatterspring forces the piston f backto its original position. When theblock 6 reaches the end of its movement away from the shoulder, thecommunication between '0 and 7c is closed, and that between a and c isagain opened, and the above described operation is repeated. Thepressure beneath the piston f canbe regulated by means of a screw 12,screwed in the conduit d. The pulsating apparatus is thus constructed insuch a manner that-at the moment when the pistons of the milking devicehave completed their forward movement and the teat having been squeezedbetween the movable and the stationary pads the position of the block iis reversed so that the fluid behind the pistons of the milking deviceis led off through the pulsator to the atmosphere.

To secure the most, advantageous results with the device the chances ofsimultaneously opening the passages band It must be reduced to anunimum,and to secure this the block i'must be moved from one position to oneanot er.

the other as quickly as possible. For this purpose several devices maybe used. The most simple one seems to be to make the block i magnetic,and the shoulders at b and j of iron, or vice versa to make saidshoulders ma etic with different poles toward Hereby the block isretained in its' end positions until the above mentioned forces formoving the same in the one or other direction have been so great as toovercome the magnetism, in which moment the block is suddenly pulledfrom one position to the other. Another method of retaining the block isshown in Fig. 2, where curved blade springs q are shown Inserted betweenthe block 11 and the wall of the casing. On account of the curved formof the springs they tend to retain the block in one or the other of itsextreme positions, but "as soon as their spring force is once overcome,the block will be suddenly carried over to its other extreme position bythe forces acting upon the block. If desired, both these opening means,magnetic block and curved blade springs, maybe used simultaneously.

In the modified form illustrated in Fig. 2 a diaphragm t is used insteadof the piston fshown in Fig. 1. The under pressure fluid entering thechamber e is thereby pressing on the under side of the diaphragm, whichis connected with the rod g, so that the latter is moved upward therebypressing the block against the shoulder as described before.

Having described the invention what is claimed as new 1s:

1. In pulsators for milking machines 0 erated' by pressure, thecombination wit a casing, of a block movabletherein between 86 twoseats, two conduits o eningfinto the easing chamber above the lock,oneof said conduits opening through one of said seats, a pistonconnected with the block and 'movable-.in a partof the casin block, abranch from one o the conduits,,. opening iino the 'casingchamber'beneath the piston, a transverse partition wall between theblock and the piston, provided beneath they with the second scatter theblock, and an"9 0- outlet conduit opening in the casing chamber betweenthe partition wall and the piston.

l 2. In pulsators for milkin v machines 0 erated' by. rossure, the comination wit two seats, means for holding the block alternately towardsaid seats, two conduits opening into the casing chamber above theblock,

a, v casing, o a block movable therein between one of said conduitsopening through one of said seats, .a piston connected with the blockand movable in a part of the easof the conduits, opening in the casing'ing beneath the block, a branch from one chamber beneath the piston, atransverse artition wall between the casing chamber in which the blockis movable and thecasing chamber in which the piston is movable,

provided with the second seat for the block, 1-10 and an outlet conduitopenin." in the casing chamber between the partition wall and thepiston. r

3. In pulsators for 'milkin machines 0 erated by pressure. thecombination wit a casing divided in two compartments in 11 communicationwith one another through the partition between the compartments, of

a block movable in one of the. compartments between two seats therein,two conduits o ening into the casing chamber above the b ock, one ofsaid conduits openin throu h one of said seats, a iston connect with t 0block movablein tie other compartment of the casing, a branch from theother conduit eneath the piston, and an outlet 1 conduit opening in thepiston compartment above the piston. 4. In pulsat-ors for milkin ated bypressure, .the com ination wit a casing divided intwo compartments. incommachines 0 er-

